Siemens LMS14 User Manual page 24

Connections and wiring
Tests made by the customer
Engineering
Mounting location
24/617
Building Technologies Division
When making the wiring, ensure that the protective extra low-voltage side is
strictly separated from other sections, thus providing protection against electric
shock and making certain that EMC will not be adversely affected! The
connectors' predefined coding must be observed! Make the connections only
when the components are disconnected from power! AC 230 V terminals that are
not used must be covered by dummy plugs to ensure protection against electric
shock! A multipole isolator is required to disconnect the unit from mains supply.
For wiring the bus users, cables specified by Siemens are mandatory!
External signal sources (air pressure switch, room thermostat, DHW flow switch, etc.)
should have gold-plated silver contacts.
Both ionization probe and ignition electrode must be protected against electric shock.
Since the line to the ionization probe must be well insulated against ground, that line
together with the ionization probe must be protected against condensation and very
damp surroundings.
Warning!
Connector X17 for the burner ground must be connected as directly as
possible to protective earth (PE) of the mains cable and to X1 or X1a, pin 2, at
the mains input of the LMS14...
The burner's housing must also be connected to the protective earth of the
mains cable.
The safety regulations for protective earth wiring must be complied with in all
cases.
Neutral point is the protective earth terminal of the mains cable.
The way protective earth is wired has a considerable impact on whether the
emission limits as per DIN EN 60335 are adhered to and on the unit's EMC
performance inside the boiler.

If the boiler or burner manufacturer wants to make additional insulation and high-
voltage tests, prior approval by Siemens is required!

As regards Directive 2004/108/EC (EMC): Once this component has been installed
in the equipment, evidence and explanatory information must be provided to
demonstrate that the relevant requirements have been met.

The flow sensor (B2) and the return sensor (B7) are safety-related
components!
They must meet the requirements of DIN EN 14459:2007 Annex K while also
adhering to EN 15502-1:2012 Section 5.7.8.3.2 b).

Air circulation around the LMS14... must be ensured, enabling the unit to dissipate
the heat produced by its controller

The unit has been designed for use inside equipment of safety class I and must be
installed accordingly

Power may be switched on only when the unit is completely mounted. Otherwise,
there is a risk of electric shock at the terminals and through the cooling slots

The unit must not be exposed to drip water

Mains cables must be run completely separate from low-voltage cables (sensors),
observing a minimum distance of 100 mm
The LMS14... has been designed for mounting inside the burner or inside a control
panel. Protection against electric shock must be ensured!
User Manual LMS14...
3 Mounting and installation
CC1U7471en
28.01.2015